Barely- Ask within 30 days of buying.
- Refunds are handled through Polar.sh, which sold you the licence.
- Use the contact form and say which email you bought with.
- You do not have to give a reason.
- The money goes back to the payment method you used.
- After a refund the licence ends.
The 30-day trial costs nothing, so there is nothing to refund.
See also the terms of service. Governing law: New South Wales, Australia.